MyWebClient.cs

public class MyWebClient
{
	public async Task<string> DownloadString(string uri)
	{
		using (HttpClient client = new HttpClient())
		{
			using (HttpResponseMessage response = client.GetAsync(uri).Result)
			{
				using (HttpContent content = response.Content)
				{
					return await content.ReadAsStringAsync();
				}
			}
		}
	}
}